What does code P1127 mean on Mazda vehicles?
The heater for the heated oxygen sensor (HO2S) on bank 1 sensor 2 does not activate during self-test.
OBD-II Code Mazda
P1127 — Mazda — HO2S Bank 1 Sensor 2 Heater Not On During Key On Engine Running Self-Test
The heater for the heated oxygen sensor (HO2S) on bank 1 sensor 2 does not activate during self-test.
Common symptoms
- Reduced fuel economy
- increased emissions
Possible causes
- Faulty heater circuit
- wiring issue
Initial recommendation
Check oxygen sensor heater circuit and related wiring.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
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